Swiss cottage (6)
I believe the answer is:
chalet
'swiss cottage' is the definition.
(type of cottage often found in Swiss Alps)
'swiss' is the wordplay.
I cannot quite see how this works, but
'swiss' could be 'ch' and 'ch' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chalet that I've seen before include "Wooden house of Alpine regions" , "Swiss-style holiday house" , "Swiss cottage or small villa" , "Originally an alpine cowherd's hut" , "Wooden villa" .)